In mutt and neomutt the In-Reply-To email header field is not protected by cryptographic signing which allows an attacker to reuse an unencrypted but signed email message to impersonate the original sender.Referenceshttps://access.redhat.com/security/cve/CVE-2024-49394https://bugzilla.redhat.com/show_bug.cgi?id=2325330
